decides to go bungee jumping. Starting atop a very high bridge, elastic cords are tied to their feet and they jump off the bridge. Once has fallen a certain distance, the force of the bungee cords slows their descent until they are at the lowest point.
If the system under consideration is: , the air, and the earth; discuss the work done by the bungee cord as descends. Assume the positive y direction is up.
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